863493221 has 2 divisors, whose sum is σ = 863493222. Its totient is φ = 863493220.

The previous prime is 863493179. The next prime is 863493233. The reversal of 863493221 is 122394368.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 861422500 + 2070721 = 29350^2 + 1439^2 .

It is a cyclic number.

It is not a de Polignac number, because 863493221 - 2¹⁸ = 863231077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863493721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431746610 + 431746611.

It is an arithmetic number, because the mean of its divisors is an integer number (431746611).

Almost surely, 2^863493221 is an apocalyptic number.

It is an amenable number.

863493221 is a deficient number, since it is larger than the sum of its proper divisors (1).

863493221 is an equidigital number, since it uses as much as digits as its factorization.

863493221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 38.

The square root of 863493221 is about 29385.2551630916. The cubic root of 863493221 is about 952.2543768164.

The spelling of 863493221 in words is "eight hundred sixty-three million, four hundred ninety-three thousand, two hundred twenty-one".